Fresh Tofu - where to find it and some questions

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Obviously it's super hot today, and I was thinking about trying a nice warm weather dish I've wanted to try for a while, hiyayakko. But I don't know where to find tofu fresh enough for this, and am also kind of unclear on the rules for this sort of thing in general.

I get the impression it's only safe to eat really fresh tofu without cooking it - when does it become unsafe? Or am I totally misinformed and can I just use the stuff I find in the grocery store?